Genuine, OEM and aftermarket parts compared
Use this guide to compare genuine, OEM and aftermarket parts, and check the details that matter before you order.
Choosing the right part can save you time, reduce returns, and help you match the fit and finish your vehicle needs. The main difference is who makes the part, how it is branded, and how closely it matches the original fitment.
What the different part grades mean
Genuine parts are carmaker branded parts. They are the same as those fitted at the factory and are normally sold through the dealer network.
OEM parts come from the companies that make parts for the carmaker. Some are sold under the supplier brand rather than the carmaker brand.
Aftermarket parts are made by other manufacturers as replacements. They are designed to fit and work like the original, although materials, finish and tolerances can differ.
How this site labels parts
This site lists two grades:
- Genuine OEM for parts listed as genuine manufacturer parts
- Quality aftermarket for replacement parts from other manufacturers
The grade is shown on the product card and the product page, so you can check it before you order.
What the ACCC says about warranties
The ACCC has stated that using non genuine parts does not void a new car warranty on its own. The parts must be of appropriate quality and fit for purpose, and the work must be done to the manufacturer specifications by a suitably qualified repairer.
A manufacturer does not have to cover damage caused by a faulty non genuine part.
Consumer guarantees under the Australian Consumer Law apply to parts bought online. That means parts must be of acceptable quality, fit for purpose and match their description.
How to compare parts before you buy
Some parts listings can look similar, but the details decide whether the part is right for your vehicle. Check the vehicle series and build range first, then compare the part details against your needs.
Also look at the finish, since some parts are supplied in chrome, black, textured or primed for paint. Check what is included as well, such as globes, brackets or motors. For lighting parts, you should also check whether the part must meet the Australian Design Rules.
When genuine, OEM or aftermarket may suit you
If you want a part that matches the carmaker branding and factory fitment, genuine parts are the direct reference point. If you want a part made by the original supplier, OEM parts may be a suitable option. If you want a replacement from another manufacturer, a quality aftermarket part may suit the job when the listing matches your vehicle and application.
Whatever grade you choose, the important point is to confirm the listing details before ordering so the part matches your vehicle and the work you are doing.
What to check before ordering
- Check the product grade on the product card and product page.
- Match the part to your vehicle series and build range.
- Confirm the finish, such as chrome, black, textured or primed for paint.
- Check what is included, such as globes, brackets or motors.
- For lighting parts, check whether Australian Design Rules apply.
- Make sure the part is suitable for the job and fits your vehicle.
If you are unsure, you can send your VIN through the contact page.